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פותח על ידי קלירמאש פתרונות בע"מ -
Microstructural changes in soils induced by wetting and drying: Effects on atrazine mobility
Year:
2019
Source of publication :
Land Degradation and Development
Authors :
לוי, גיא
;
.
Volume :
30
Co-Authors:

Dor, M., Department of Soil and Water Science, The R.H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot, 76100, Israel, Institute of Earth Sciences, The Hebrew University of Jerusalem, Jerusalem, 9190401, Israel; Emmanuel, S., Institute of Earth Sciences, The Hebrew University of Jerusalem, Jerusalem, 9190401, Israel; Brumfeld, V., Department of Chemical Research Support, Weizmann Institute of Science, Rehovot, 7610001, Israel; Mishael, Y.G., Department of Soil and Water Science, The R.H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot, 76100, Israel

Facilitators :
From page:
746
To page:
755
(
Total pages:
10
)
Abstract:

Wetting and drying affects soil structure and pesticide migration, which both may lead to land degradation. The effect on soil structure has been mainly addressed by classical methods at the macroaggregate scale, and the effect on herbicide leaching has not been thoroughly addressed. We aimed to characterize the effects of wetting and drying on soil microstructure, aggregate packing and stability, and subsequent effect on pesticide mobility in three agricultural soils. We developed advanced methods to quantitatively describe soil microstructure changes, induced by wetting and drying. Changes in soil packing, observed by micro-CT, indicate that large aggregates in a Clay soil disintegrate, whereas particles from a Sandy Loam form larger aggregates. To reflect these changes in terms of soil stability, we developed an aggregate durability index, based on changes in soil particle-size distribution measured by laser granulometry. For a Clay soil, the index decreased from 17.0% to 1.7%, indicating soil disaggregation upon wetting and drying. Whereas for a Sandy Clay Loam soil, the index increased from 0.4% to 2.6%, indicating formation of more durable aggregates, explained in terms of cementation by CaCO3. As expected, wetting and drying did not alter a Loamy Sand soil structure. The adverse effects of wetting and drying on soil structure correspond with the trends of atrazine mobility. As atrazine is trapped within the Clay soil aggregates, disaggregation leads to a 35% enhancement in pesticide mobility, whereas stabilization of a Sandy Clay Loam aggregates reduced atrazine leaching by 23%. Finally, wetting and drying directly affects the soil microstructure, which has an immense indirect effect on pollutant mobility, with both potentially leading to land degradation. © 2019 John Wiley & Sons, Ltd.

Note:
Related Files :
Calcite
Clay
Computerized tomography
drying
herbicides
Particle size analysis
Pesticide effects
soil pollution
Wetting
עוד תגיות
תוכן קשור
More details
DOI :
10.1002/ldr.3256
Article number:
0
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
39372
Last updated date:
02/03/2022 17:27
Creation date:
20/02/2019 11:33
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Scientific Publication
Microstructural changes in soils induced by wetting and drying: Effects on atrazine mobility
30

Dor, M., Department of Soil and Water Science, The R.H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot, 76100, Israel, Institute of Earth Sciences, The Hebrew University of Jerusalem, Jerusalem, 9190401, Israel; Emmanuel, S., Institute of Earth Sciences, The Hebrew University of Jerusalem, Jerusalem, 9190401, Israel; Brumfeld, V., Department of Chemical Research Support, Weizmann Institute of Science, Rehovot, 7610001, Israel; Mishael, Y.G., Department of Soil and Water Science, The R.H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot, 76100, Israel

Microstructural changes in soils induced by wetting and drying: Effects on atrazine mobility

Wetting and drying affects soil structure and pesticide migration, which both may lead to land degradation. The effect on soil structure has been mainly addressed by classical methods at the macroaggregate scale, and the effect on herbicide leaching has not been thoroughly addressed. We aimed to characterize the effects of wetting and drying on soil microstructure, aggregate packing and stability, and subsequent effect on pesticide mobility in three agricultural soils. We developed advanced methods to quantitatively describe soil microstructure changes, induced by wetting and drying. Changes in soil packing, observed by micro-CT, indicate that large aggregates in a Clay soil disintegrate, whereas particles from a Sandy Loam form larger aggregates. To reflect these changes in terms of soil stability, we developed an aggregate durability index, based on changes in soil particle-size distribution measured by laser granulometry. For a Clay soil, the index decreased from 17.0% to 1.7%, indicating soil disaggregation upon wetting and drying. Whereas for a Sandy Clay Loam soil, the index increased from 0.4% to 2.6%, indicating formation of more durable aggregates, explained in terms of cementation by CaCO3. As expected, wetting and drying did not alter a Loamy Sand soil structure. The adverse effects of wetting and drying on soil structure correspond with the trends of atrazine mobility. As atrazine is trapped within the Clay soil aggregates, disaggregation leads to a 35% enhancement in pesticide mobility, whereas stabilization of a Sandy Clay Loam aggregates reduced atrazine leaching by 23%. Finally, wetting and drying directly affects the soil microstructure, which has an immense indirect effect on pollutant mobility, with both potentially leading to land degradation. © 2019 John Wiley & Sons, Ltd.

Scientific Publication
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